Skip to main content
Manage Claude Code binary versions. Binaries are downloaded from Anthropic’s official distribution with SHA256 checksum verification.

​
install

Download and install a Claude Code version. 
cac claude install latest
cac claude install 2.1.81
If the version is already installed, it’s a no-op. Downloads show a progress bar. When you use -c latest in cac env create, the version is resolved and auto-installed — you don’t need to run install first.

​
ls

List all installed Claude Code versions. 
cac claude ls

Installed Claude Code versions:

  2.1.81 (latest) — 2 environment(s)
  2.1.80

  System: /root/.local/bin/claude (2.1.81)
Shows which version is marked as latest, how many environments use each version, and the system-installed Claude Code path if present.

​
pin

Pin the current active environment to a specific version. 
cac claude pin 2.1.81
This writes the version to ~/.cac/envs/<name>/version. The wrapper resolves this file at launch time, so the change takes effect on the next claude invocation.

​
uninstall

Remove an installed version. Fails if any environment is using it. 
cac claude uninstall 2.1.80
You cannot uninstall a version that is pinned by any environment. Remove or re-pin those environments first.